Mounting for artificial dentures



March 3, 1953 c. LEVINE ET AL 2,629,929

MOUNTING FOR ARTIFICIAL DENTURES Filed March 17. 1952 2 SHEETS-SHEET l l5 INVENTORS C HARL E5 LEVINE BYDA v10 SALLAN ATTORNEY March 3, 1953 c, LEVlNE ET AL 2,629,929

MOUNTING FOR ARTIFICIAL DENTURES Filed March 17, 1952 2 SHEETSSHEET 2 22 25 |n 22 C 7 .5. P (41 I7 20 C 7 D \u I I u/ T av 4 F iii. 5.

' INVENTORS CHARLES LEV/NE 45 47 BY DAV/D SALLAN Mme M ATTORNEY Patented Mar. 3, 1953 UNITED STATES PATENT OFFICE V V 2,629,929 MOUNTING FOR ARTIFICIAL n'Eiv'r REs Charles Levine and David Sallan, Los Angeles,

Calif.,- assignors, by direct'and mesne'assign-Z' ments, to Mes'h-Lite Engineering Research Corp.; Hollywood, Calif., a corporation of California Our invention relates generallyto the art of molding articles, and more particularly to the manufacture of artificial-dentures.

In its broad aspect, the primary object of our invention is to provide means by Which the removal of a core from an undercut mold will be greatly facilitated, and, more specifically to provide a device by which an undercut model may be removed from an artificial denture without danger of cracking, breaking, or in any way structurally damaging the denture.

Another object of our invention is to provide a device of the above described character embodying means for absorbing and retaining heat from a plastic denture when plasticized, so as to aid in curing the denture.

A further object of our invention is to provide a device which enables a denture to be removed from an articulator as often as desired for milling in the teeth in occlusion, without afiecting registration of the denture, thus greatly simplifying and expediting the manufacture of the denture. With these and other objects in view, our in vention resides in the combinations, arrangements and functionalrelationships of elements as set forth in the following specification and particularly pointed outin the appended claims.

In the accompanying drawings, a

Figure 1 is a view showing in vertical central section, one form of mounting for artificial denture models embodying our invention;

Figure 2 is a transverse sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a top plan view of a mounting plat embodied in our invention;

Figure 4 is a bottom plan view of the mounting plate;

Figure 5 is a top plan view of amodel divider core for an upper denture, embodied in our invention;

Figure 6 is abottom plan View of the model divider core shown in Figure 5;

Figure '7 is a View in side elevation,'of the model divider core shown in Figures 5 and 6;

Figure 8 is a view in front elevation, of the model divider core shown in Figures 5 and 6; Y

Figure 9 is a top plan view of a model divider core for a lower denture, embodied in our invention; a

Figure 10 is a bottom plan view of the model divider core shown in Figure 9; and

Figure 11 is a vertical longitudinal sectional '1 was. (01. 32-32) view of :a jarring tool embodied in our invention,

and showing the tool applied for use in the re-- moval of amodel divider core from the model of an upper denture." 7

Referring specifically to the drawings, our invention, in its present embodiment broadly comprises amounting'element E for both upper and lower dentures,-a model divider core C for upper dentures, a model divider core C for lower dentures, andaj-arring to'ol J.

Each of the two identical mounting elements E is intheform of a thin, fiat, metal plate ill having the general plan configuration ofv a dental arch, andis provided on one side with suitable holding means'such as'intersecting grooves H and 12; The grooves II and I2 are adapted to receive" plaster from a mass thereof to form plaster key-s attaching the plate to either the base jawl3 or 'the'movable jaw M of a conventional articulator A, according'as the plate is to be used in conjunction with a lower denture or an upper denture as shown in Figure l.

On its other side the'plate It is provided with locating me'ans in the form of a number of projections such as round'pins l5 of which three areshown approximately equally spaced in the present illustration.

Theniddel; divider coreC is also in the form of a fiat metalplate 20 having a plan configuration similar to that of the plate I0, and is provided on one side with locating means in the form of a number-of recesses 2 I, three in number and spaced toreceive the pins l5 of the plate Hi to establish a fixed relationship between the plates. p i H The other side of .the plate 20 is provided with a numberof'tapered partition'walls or dividing fins 22, some "of which may extend transversely from a center wall 23,and others longitudinally to the front of the plate'from the closest transverse fin 22 as shown at 24. 1

Ihe pattern of these fins maybe Widely varied, itonly being necessary that when the core is pressed into a plaster model P of an upper denture D,jthe corewill divide the mass of plaster into weakly connected sections and will firmly adhere to the model when set, for mounting of p 34,;inthe plateiil, which groove is spanned by cross bars35 at opposite sides of thestud 3i all to the end of detachably securing the core C to the mounting element E in a predetermined fixed relationship so as to rigidly and demountably support the upper denture D from the movable jaw l4 of the articulator.

The core C for lower dentures is of generally horseshoe configuration in plan as shown in Figures 9 and 10, and is spanned transversely at its open end by a rigid connecting strut 40, and medially by a cross bar 4!. The upper side of the core C is provided with a staggered arrange ment of tapered partitions or dividing fins 42, whereas the lower side of the core is provided with recesses 43 spaced to receive the locating pins l of the mounting element E, and a central opening 44 to receive the stud 39 of the element E, all in the same manner and for the same purpose as previously described in the assembly of the core C with an upper denture.

The lower side of the core C is also provided with a groove 46 intersecting the opening 44 and spanned by cross bars 41 so as to receive one of the locking pins 33 for co-action of the pin with the stud and the cross bars 41 in detachably securing the core C to the mounting element E in a predetermined fixed relationship, whereby to rigidly and demountably support the lower denture D from the base jaw 13 of the articulator through the medium of the plaster model P as clearly shown in Figure 1.

The jarring tool J shown in Figure 11 comprises a rod 50 on which is mounted a weight 5! freely slidable between a stop nut 52 on one end of the rod and a stop collar 53 adjacent to the other end of the rod, which other end is screw threaded as shown at 54. The threaded end 54 of the rod 50 is adapted to be screwed into a threaded socket 55 in the core C at the bottom of the opening 3| of the core, or into a threaded socket 56 (Figure 1) in the core C at the bottom of the opening 44 of the latter, for co-action with the respective core in the operation of the invention which is as follows:

As the steps of mounting the upper and lower dentures in the respective jaws of the articulator are identical, a description of the steps for mounting an upper denture will suflice for both dentures. One of the mounting elements E is first aflixed to the jaw l4 by applying a mass of plaster thereto while the element is held flatthe denture D has been molded, is now applied to the element E in a position for the egister or locating pins I5 to enter the openings 2|, and the stud 30 to enter the opening 3|, all as clearly shown in Figure 1.

One of the locking pins 33 is now passed through the groove 34 and through the opening 32 in the stud 30 for co-action therewith and with the cross bars 35 in detachably securing the core C rigidly to the element E in a definite fixed position. By withdrawing the locking pin 33, the denture D with the core rigidly embedded in the plaster model P can be entirely removed from the jaw [4 of the articulator for milling in the teeth in occlusion, or for any other purpose.

By the provision of the mounting element E and the co-acting core C, the denture may be removed and replaced in the articulator as often as desired without affecting the original registration or position of the denture with respect to the articulator .iaw.

When the denture is to be separated from the plaster model P, the threaded end 54 of the jarring tool J is screwed into the threaded socket 55 of the core C. By now sliding the weight 5| on the rod 50 with a hammering action against the stop 53, the core will be jarred loose from the model, the loosening being facilitated by the tapered form or draft of the fins 22 and 24 which enables them to be readily freed and withdrawn from the pastel.

As the plaster model contains an impression of the fins 22 and 24 and the central wall 23 in the form of complementary grooves, the model is divided by these grooves into weakly connected sections which are easily separated and freed from the denture regardless of undercuts therein, and without any danger of cracking, breaking, marring or otherwise structurally damaging the denture, as well as materially expediting the process of manufacturing the denture. It will also be noted that with the cores C and C constructed of metal, that during the curing operation of a plastic denture on a plaster model, the heat from the plasticizing denture will be rapidly absorbed by the core so as to materially expedite the curing.

We claim:

1. A mounting for artificial dentures comprising: a mounting element having plaster keying means by which said element can be rigidly secured by a body of plaster to a jaw of an articulator; a divider core adapted to be embedded in a plaster model on which a denture is molded; said element and core having co-acting means establishing a fixed relationship between the element and core when the latter is applied to the element; said element and core having co-acting connecting means detachably securing the core to the element so as to permit removal of the denture and replacement thereof in the articulator without disturbing the registration between the denture and articulator.

2. A mounting for artificial dentures comprising: a mounting element having plaster keying means by which said element can be rigidly secured by a body of plaster to a jaw of an articulator; a divider core adapted to be embedded in a plaster model on which a denture is molded; said element and core having co-acting locating means establishing a fixed relationship between the element and core when the latter is applied to the element; said element and core having coacting connecting means detachably securing the core to the element 50 as to permit removal of the denture and replacement thereof in the articulator without disturbing the aforesaid fixed relationship; said core having laterally projecting partition walls arranged to be embedded in the plaster model to divide same into weakly connected sections for easy removal without damage to the denture.

3. A mounting for artificial dentures comprising: a mounting element having plaster keying means by which said element can be rigidly secured by a body of plaster to a jaw of an articulator; a divider core adapted to be embedded in a plaster model on which a denture is molded; said element and core having co-acting locating means establishing a fixed relationship between the element and core when the latter is applied to the element; said element and core having co-acting connecting means detachably securing the core to the element so as to permit the removal of the denture and replacement thereof in the articulator without disturbing the aforesaid fixed relationship; said core having laterally projecting partition walls arranged to be embedded in the plaster model to divide same into weakly connected sections for easy removal without damage to the denture; said core having means to which a jarring tool is attachable for jarring the core loose from the denture model.

4. A mounting for artificial dentures comprising: a mounting element having plaster keying means by which said element can be rigidly secured by a body of plaster to a jaw of an articulator; a divider core adapted to be imbedded in a plaster model on which a denture is molded; said element and core having co-acting locating means establishing a fixed relationship between the element and core when the latter is applied to the element; said element and core having co-acting connecting means detachably securing the core to the element so as to permit removal of the denture and replacement thereof in the articulator without disturbing the aforesaid fixed relationship; said core being constructed of heat conducting material capable of rapidly absorbing heat from a plasticized denture during curing of the denture on the model, so as to expedite the curing operation.

5. A mounting for artificial dentures comprising: a mounting plate having one side grooved to provide plaster keying means by which said plate can be rigidly attached by a body of plaster to a jaw of an articulator; a divider core plate having laterally projecting partitioning walls adapted to be embedded in a plaster model on which a denture is molded; the other sides of said plates having co-acting locating means providing a fixed relationship between the plates when said core plate is applied to said mounting plate; and means co-acting with said plates to detachably secure said core plate to said mounting plate so as to permit removal of the denture and its replacement in the articulator without disturbing the aforesaid fixed relationship.

6. A mounting for artificial dentures comprising: a mounting plate having one side grooved to provide plaster keying means by which said plate can be rigidly attached by a body of plaster to a jaw of an articulator; a divider core plate having laterally projecting partitioning means adapted to be embedded in a plaster model on which a denture is molded; the other sides of said plates having co-acting locating means providing a fixed relationship between the plates when said core plate is applied to said mounting plate; said other side of one of said plates having a recess, and said other side of the other of said plates having an attaching stud received in said recess; and a locking member co-acting with said stud and said one of said plates to detachably secure the plates together.

7. A mounting for artificial dentures comprising: a mounting plate having one side grooved to provide plaster keying means by which said plate can be rigidly attached by a body of plaster to a jaw of an articulator; a divider core plate having laterally projecting partitioning walls adapted to be embedded in a plaster model on which a denture is molded; the other sides of said plates having co-acting locating means providing a fixed relationship between the plates when said core plate is applied to said mounting plate; said other side of one of said plates having a recess and a groove intersecting the recess; cross bars spanning the groove at opposite sides of the recess; said other side of the other of said plates having an attaching stud received in said recess and provided with a through opening; and a locking pin received in said groove and passing through said opening of said stud for co-action with the stud and with said cross bars in detachably securing the plates together.

CHARLES LEVINE. DAVID SALLAN.

REFERENCES crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,535,146 Lyons Dec. 26, 1950 FOREIGN PATENTS Number Country Date 925,936 France Apr. 14, 1947 

